Service-observing circuit for telephone-lines.



C. W. KECKLER.

SERVICE OBSERVING CIRCUIT FOR TELEPHONE LlNES.

APPLlCATION FILED APR.14.1915.

Patented July 16, 1918.

to o ers 1e leghone lnVen/or: Char/es Keck/e,

rm: mamas PETERS m. PHO'ruLlrno wASHlNcwN. u. c.

gized upon LER,

unrrnn sra'rns PATENT CHARLES W. KECKLER, F NEWARK, -1\TI E|NJERSEY,v ASSIGNOR, BY MESNE ASSIGN- MENTS, TO WESTERN ELECTRIC COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

SERVICE-OBSERVING CI [RCU IT FOR TELEPHONE-LINES,

To all whom it may concern: V Be it known that I, CHARLES W. Knox a citizen of the United States, residing at Newark, in thecounty of Essex and State of New Jersey, have invented certain new and useful Improvements in Service-Observing Circuits for Telephone-Lines, of which the following is a full,-clear,' concise, and exact description. i. I

This invention "relates to telephone exchange systems, and more particularly to a service observing circuit adapted'ato he associated with a subscribers line, I l

Heretofore service observing circuits have been provided inexchanges where a main and intermediate distributing frame are used. The object of this invention is to pro- 7 vide a service observing circuit adapted to,

be used'in exchanges where only a main distributing frame isavailable. f

In accordance with this invention there is provided a service observing circuit adapted to be connected with the talking conductors of a subscribers line. This circuit is inserted in a subscribers: line circuit at some point intermediate the main distribut-: ing frame and the line jack in which said subscribersline terminates. Included in the observing circuit are a pluralityof indicating devices, one of said devices being adapt ed to beactuated whenever a call is, initiated upon a subscribers line with which said circuit has been associated, and another of said devices being adapted to be actuated whenever a call is received upon said line. Through the medium of these indicating devices an observing operator will be informed as tothe class of, service Trendered a'given i subscriberythe time requ redto render 'sa d 1 service,:etc;r

Thisinvention 1s illustrated the accom-- panying drawing in which Figure l-shows'an arrangement of apparatus wired in accordance with this invention, :andi-Fig. 2 ;is"a modification of part :of' the circu t shown in Fig, 1. 1 :1,

A :sub'scribers substationaisconnected means of linecwires 1,-2'toalinejack 310 cated atia-central officeaAssociatedwith the: line circuit. is aline relay Land a c'utofi re' lay 5,- the' former being fadapted-to berenerthe removal of'the receiver from the switchhook Fat the substation and? the latter being energized :When the. operator in;

. Specification of Letters Patent.

Application filed April 14,

in the usual manner.

- cuit being preferably connected 'ratus' comprising following circuit is established ing a circuit for a answering plug.

ate the relay19 over battery 28,- conductor jack 3,: conductor- 20,

Patented July 16,1918.

1915. Serial No. 21,251.

serts an answering plug 6 into the line jack 3. The line relay 1 controlsa line lamp 7 A service observing circuit 8 is adapted to be associated with the circuit ofthe substation, said observing cirwith said line circuit at the main frame. The appathe observing circuit 8 is locatedon a special board having a special attendant for the purpose of observing the performance and efficiency of any given operatonl The equipment included in the ob serving circuit is adapted to serve only one line at a time; consequently where it is necessary .to render special service to several subscriberssimultaneously, several of these circuits must be supplied.

.The operation of the apparatus shown in the drawing is as follows: When a subscriber at the substation removes his receiver from the hook, in addition to effecting the energization of the line relay 4: the following circuit is established: source of current 9, winding 10 of relay 1, conductor 11, contact 12, conductor 14:, line wire 2, through the substation and return by way of line wire 1, conductor 15, contacts 16, 17 winding of relay18 to ground. Simultaneously with the completion of this circuit just traced, the through the relay 19: battery 9, coil 10 of relay 4, conductor 11, contact 12, conductor 14, line wire 2, through the substation and back, line wire 1, conductor 20, contact 21, winding 22 0f reconductor lay to ground. It may be mentioned here 15, Winding .of relay 19,

that the relay 19 is of the marginal type and does not respond at this time.

The-.(e'nergjization of the relay 18, brought the closure of the circuit traced about, p

25, thus establishaboveg tcloses its contact 26, contact 25 to ground; The lamp26 will rent ofsuflicient strength is suppliedto actuthe following circuit: 29, contact '30 of the Y signal or lamp 26, which may be traced as follows: battery 27, lamp ri'nging ky 31, sleeve side of the plu'gz6 and winding of relay. 19, 7

the establishment of ce'ssity-oi5-1operating restore-1' the relay conductor 15, line Wire 1, through the substation and return by Way of line Wire 2, conductor-. 14, tip of the Jack '8 and plug: 6,

contact -33 i'to the 1 other side of battery: 28:;

actuation of the ringing key 31, addition to ringingthebells at-the substatlon the fole lowing 1 circuit i is icompletedr through the -r e-. lay 321* sourceiof. generator 34,"iconta'cti 35 sleeve-ofthe plug 6 and jack 3, conductors' 20, 36,.Windin'g 37 0f relay 32,

3 and plug 6, contact'39.togr0und.r1 l he relay 32 is adaptedr-to-vbe energized: by alter-- natlng current, and in' 'pulllng upiorms a lockingmci-rcuit for itself which may be tracedwas followsz batteryi;41;=winding 40 of relay 32 contact-42, conductor- 43, /contact=r 44 oizthe operator-"s listening "key; 45, to ground-"The closure of this circuit effects a circuit through :the& lamp 47 over the following lamp 4 1?; conductor 48, coil' ductor-=495 contact 44 toground. The closure of -this" circuit lights the lamp 47 and-causes the energiZation of the' relay 46 Which inpulling=up its armatureopens the contact 16 and closes contact 23, thus shunting the relay 191: out of the ringing: circuit, thereby. creatin'g 'a low-resistance path for. the-ringingcurrent appliedto thesubscribers line. The relay 32 Will 5 remain energized until: the listening key 45::hasbee11' operated-in a mannerto" open contact 44. r

Fig. 2 shows =a.- modificationotth'e arrangement of-the: apparatus comprising the observingcircuitshown: in Fig. l. In place of providing a locking circuit for'therelay 32 as disclosed 'in=-Fig.- 1, this featurefimay be omitted-as illustrated in'Fig. 2. Accord ing to the circuit connection 'shoWn-in-"Fig.

of relay 46, con

2, therel ay 32. wi11- be energized during-the he fltac me t o-fthe period-ringing current isappliedto the; line; and in e'vent" machine ringing iourrent is used, saiiclarelay will be energizedhand deenergized: periodically; in synchronism :With the application oft ringing rcurrent J to "the line. @The energi'zation and deenergiz'ation of I the relay 32. will flash the circuit through' 'isaid lammusf'closed and opened bycthe' actuation of the relay- 32. By this arrangement, it' i serving-foperator:W1 I

he r listening "key 45; to

Whenever the- :subscribens 'l-ine' unde rQ obser vation vi'ras cal'lc'd; andLatrtheflsame timegdue through the.- condeiiser 38; conductor l4, tip of theujackpath: battery- 27;

42, conductor 43, conta0tficsaid line circuit, a signaling zdeviceiincluded lamp-941 the and an energizing circuit for the second-merit? obvious zth g h B 7. e relieved of" the a net;

to the flashing of the lamp 47, she Would be 'informed'of the interval of time during E.Li:'WlIiCl1 tin-gin antenn -wasapplied to the 1 v calledline di i v a From the above it will be appare nta that in cases Where special attention is desired "to bepaid to certainsubscribers lines by the means provided in this invention, a "*eheckmaybepbtained upon the service rem: vdered in establishingconnections with incoming and outgoing calls to a given substation. c

What is claimed is: a I ":1. 111a telephone system, *arline lci-rcuit i tern'lin'atingaat acentnalioflice; aws'ervice'zoo r b0? i serving: :circuiti*connectedrzwitlr theatalking. conductorsrofz the 9 line ecircuitp a. signaling i a :d'evice' therefor controlled over theflinef cire. r '1 'cuit and2operated-2uiioi1 the 'IGIHOVEL'I OIE"the? 'r-receiver from the switchhookito zfurnishi a signalpa connecting-2circuits. at 4 the central '7 ollice and a relay ini-circuit with the talkingui conductors *ofcthe. line: iClllI'Gell'lfi irenderedi efe.

-:facement otwthe:signal; V r

a 2. Inta telephon-ei 'tsystemgi aaline: circuit z terminating? in line -j mile at a=. .central office, a servicemobservingccircnit1-'ada ptedz-to. ebe v connectedu with the talking wconductors of.

- in said services observing .'l(ilI=6lllt,--".a} relay adapted'towbe energized-oven said: line Loir cuit lev the reniova-kot the receiveiz from thew r11 iswitchhookfor' eifecting the:operationi of 1100 said signaling deviceg a connecting; circuit-at Jr the exchange;ianda'relay.incfseries' with-said line conductors which? becomes: operative: wu'pon connection -of saidi connectingmircuit a 1 with said ili nelcon'ductors =for--efiaci11g'said ies-4 signal-.2; 1 7 V 3. Inf'a telephonesystennaline-circuit ex r1: tending-"from *a: subscribers stationwto' and 11; terminating'tatxar centralfiofiice a line isigfi': :.-nal for; the-1 telephone iline; a service observe *ing signal-tor theliiie;:a relay energized upon the removal: ot "the receiver from the-z. ;sv'vitcl1h0ok .'foricausing thecoperationrot theiservice observing-signalpai relay forcaushig service observing' sig 1-15 jnnal, a line relay controlling the line signal Mani energizingc'clircuitiion tlie line-==relay' a tablished' upon thefremova'l'fioii the receiverw from the sw itchhook and. including-:ctheg sq: Y winding: "of the i.second-mentionedeirelay, 12.0 link circuitforrextending ithe telephonekline;

tionedlrelayi established Juponth'e connectionz Df:=tl1$- linkcircu-itc With/the telephonealinew 14. In-I'a 'telephone 'systemg lineccircuit terminatingnat a: centraloificefzt serniceob servingvcircuit zconnected with 'the italking conductors of the lineicircuifiaisigrnaling de lavice therefor; awrelayi in *circuit with the talking: 3ccim'il-uctorsuteri:controlling 1 the; sig 1 3 0" rionaling device, a source of ringing current, a relay bridged across the talking conductors and responsive to current from said source, a signaling device controlled thereby, a rclay actuated upon the operation of the bridged relay for disabling the first-mentioned relay while ringing current is applied to the line.

5. In a telephone system, a line circuit eX- tending from a subscribers station to and terminating at a central. ofiice, a line signal for the line, a line relay controlling the line signal, a service observing signal, a first and a second relay controlling the service observing signal, an energizing circuit for the line relay established upon the removal of the receiver from the switchhook and including the winding of the second relay, an energizing circuit for the first relay established upon the removal of the receiver from the switchhook and including a normally closed contact controlled by the second relay, a link circuit for extending the telephone line, and an energizing circuit for the second relay established upon the connection of the link circuit with the telephone line, whereby the normally closed contact is opened.

6. In a telephone system, a line circuit extending from a subscribers station to and terminating at a central office, a line signal for the line, a line relay controlling the line signal, a service observing signal, a first and a second relay controlling the service observing signal, an energizing circuit for the line relay established upon the removal of the receiver from the switchhook and including the winding of the second relay, an energizing circuit for the first relay established upon the removal of the receiver from the switchhoo'k and including the normally closed contact of the second relay, a link circuit for extending the telephone line, and an energizing circuit for the second relay including contacts of the engaged link and line circuits.

7. In a telephone system, a line circuit extending from a subscribers station to and Copies of this patent may terminating at a central ofiice, a line signal for the line, a line relay controlling the line signal, a service-observing signal, a first relay connected in series with the line circuit, a second relay connected with the line circuit through a normally closed contact of the first relay and cooperating therewith to 0011- trol the service observing signal, an energizing circuit for the line relay established upon the removal of the receiver from the switchhook and including the winding of the first relay, an energizing circuit for the second relay established upon the removal of the receiver from the switchhook, a link circuit for extending the telephone line, and an energizing circuit for the first relay established upon the connection of the link circuit with the telephone line for disconnecting the second relay from the line,

8. In a telephone system, a line circuit extending from a subscribers station to and terminating at a central oflice, a line signal for the line, a line. relay controlling the line signal, a service observing signal, a first re lay connected in series with the line circuit, a second relay connected with the line circuit through a normally closed contact of the first relay and cooperating therewith to control the service observing signal, an energizing circuit for the line relay established upon the removal of the receiver from the switchhook and including the winding of the first relay, an energizing circuit for the second relay established upon the removal of the receiver from the switchhook, a link circuit for extending the telephone line, an energizing circuit for the first relay established upon the connection of the link circuit with the telephone line, a source of ringing current, and a relay responsive to the connection of the ringing current with the telephone line for removing the first relay from the line circuit. a

In witness whereof, I hereunto subscribe my name this 13th day of April A. D., 1915.

CHARLES W. KEGKLER be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

